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Articles 3211 - 3240 of 5201
Full-Text Articles in Geology
Machine Learning Applied To A Modern-Pleistocene Petrographic Data Set: The Global Prediction Of Sand Modal Composition (Gloprsm) Model, J. Isaac Johnson, Glenn R. Sharman, Eugene Szymanski, Xiao Huang
Machine Learning Applied To A Modern-Pleistocene Petrographic Data Set: The Global Prediction Of Sand Modal Composition (Gloprsm) Model, J. Isaac Johnson, Glenn R. Sharman, Eugene Szymanski, Xiao Huang
Geosciences Faculty Publications and Presentations
Petrography has long been used as a tool to decipher the sedimentary provenance of sand and sandstone based on relative proportions of detrital grain types. However, there is not yet a predictive framework that constrains the relationship between sand grain composition and the factors that influence it, including bedrock lithology, elevation, slope, basin area, precipitation, and temperature. We used a globally extensive modal point-count data set of 3,522 Pleistocene to modern sand samples to train an inline series of random forest meta-estimators to predict relative abundances of quartz (Q), feldspar (F), and lithic (L) grain types and eight subcompositions. The …
Mid To Late Neogene (5.9-3.7 Ma) Epeirogenic Uplift And Associated Ultramafic Volcanism, Canterbury Basin, New Zealand, Katherine Anne Dvorak
Mid To Late Neogene (5.9-3.7 Ma) Epeirogenic Uplift And Associated Ultramafic Volcanism, Canterbury Basin, New Zealand, Katherine Anne Dvorak
Dissertations
Cored marine sediments from Canterbury Basin Integrated Ocean Drilling Program (IODP) Expedition 317 shelf sites U1351, U1353, and upper slope Site U1352 have been resampled with emphasis on benthic foraminifera from the Late Eocene to Late Pliocene. These new data coupled with paleo water-depth and age data from the nearby Clipper-1 petroleum exploration well, are used to develop a 1-dimensional basin subsidence model for the Canterbury Basin. Our model indicates there was widespread epeirogenic uplift of 890 350m, in the mid-Neogene (5.9-3.7 million years ago), which took place during concomitant ultramafic volcanism. Close association of uplift and volcanism could …
Reactive Iron Mineral Coatings In Redox Transition Zones Of A Site With Historical Contamination: Abiotic Attenuation, Xin Yin
Dissertations
Reactive iron mineral coatings are found throughout reduction-oxidation (redox) transition zones and play a significant role in contaminant transformation processes. In this study, an 18.3-meter core is collected, subsampled, and preserved under anoxic conditions to maintain its original redox state. Screening analyses are conducted at sampling increments of 5.08 cm in depth for the following: elemental concentrations with X-ray fluorescence (XRF), sediment pH, sediment oxidation-reduction potential (ORP), total volatile organic carbon (TVOC) in the sample headspace, and abundant bacteria (16S rRNA sequencing). Using the Fe and S gradients correlated with microbial data, five RTZs are delineated. To characterize iron mineral …
The Concept Of Tectonic Provenance: Case Study Of The Gigantic Markagunt Gravity Slide Basal Layer, Danika F. Mayback, Michael J. Braunagel, David H. Malone, W. Ashley Griffith, Mckenna E. Holliday, Tiffany A. Rivera, Robert F. Biek, David B. Hacker, Peter D. Rowley
The Concept Of Tectonic Provenance: Case Study Of The Gigantic Markagunt Gravity Slide Basal Layer, Danika F. Mayback, Michael J. Braunagel, David H. Malone, W. Ashley Griffith, Mckenna E. Holliday, Tiffany A. Rivera, Robert F. Biek, David B. Hacker, Peter D. Rowley
Faculty Publications - Geography, Geology, and the Environment
Formation and evolution of the basal layer in large landslides has important implications for processes that reduce frictional resistance to sliding. In this report, we show that zircon geochronology and tectonic provenance can be used to investigate the basal layer of the gigantic-scale Markagunt gravity slide of Utah, USA. Basal layer and clastic injectite samples have unique tectonic chronofacies that identify the rock units that were broken down during emplacement. Our results show that basal material from sites on the former land surface is statistically indistinguishable and formed primarily by the breakdown of upper plate lithologies during sliding. Decapitated injectites …
Toxicological Responses To Sublethal Anticoagulant Rodenticide Exposure In Free‑Flying Hawks, Nimish B. Vyas, Barnett A. Rattner, J. Michael Lockhart, Craig S. Hulse, Clifford P. Rice, Frank Kuncir, Kevin Kritz
Toxicological Responses To Sublethal Anticoagulant Rodenticide Exposure In Free‑Flying Hawks, Nimish B. Vyas, Barnett A. Rattner, J. Michael Lockhart, Craig S. Hulse, Clifford P. Rice, Frank Kuncir, Kevin Kritz
United States Geological Survey: Staff Publications
An important component of assessing the hazards of anticoagulant rodenticides to non-target wildlife is observations in exposed free-ranging individuals. The objective of this study was to determine whether environmentally realistic, sublethal first-generation anticoagulant rodenticide (FGAR) exposures via prey can result in direct or indirect adverse effects to free-flying raptors. We offered black-tailed prairie dogs (Cynomys ludovicianus) that had fed on Rozol® Prairie Dog Bait (Rozol, 0.005% active ingredient chlorophacinone, CPN) to six wild-caught red-tailed hawks (RTHA, Buteo jamaicensis), and also offered black-tailed prairie dogs that were not exposed to Rozol to another two wild-caught RTHAs for 7 …
Within‑Marsh And Landscape Features Structure Ribbed Mussel Distribution In Georgia, Usa, Marshes, William K. Annis, Elizabeth A. Hunter, John M. Carroll
Within‑Marsh And Landscape Features Structure Ribbed Mussel Distribution In Georgia, Usa, Marshes, William K. Annis, Elizabeth A. Hunter, John M. Carroll
United States Geological Survey: Staff Publications
Ribbed mussels, Geukensia demissa, are marsh fauna that are used in coastal management and restoration due to the ecosystem services they provide. Ribbed mussel restoration efforts may be improved with a greater understanding of the environmental drivers of ribbed mussel distribution at multiple spatial scales to predict areas where restoration could be successful. This study sought to estimate the effects of within-marsh (4 m) and landscape (500 m) factors on ribbed mussel distribution. Ribbed mussel densities were surveyed at 11 sites along the coast of Georgia, USA, and overlaid with spatial data for within-marsh factors (elevation, distance to marsh …
Climatic Backdrop For Pueblo Cultural Development In The Southwestern United States, Victor J. Polyak, Yemane Asmerom, Matthew S. Lachniet
Climatic Backdrop For Pueblo Cultural Development In The Southwestern United States, Victor J. Polyak, Yemane Asmerom, Matthew S. Lachniet
Geoscience Faculty Research
While climatic triggers for collapse and population migrations of ancestral Pueblo communities have been proposed, little is known about the overall climatic backdrop for the entire pre-Hispanic Pueblo period (ca. 1300 to 460 B2K). Here, we report data from stalagmite HC-1, from Hidden Cave, Guadalupe Mountains, New Mexico, covering the past 3400 years, showing an interval of increased frequency of droughts from 1260 to 370 yr B2K that is coeval with the entire pre-Hispanic Pueblo period. Our record suggests that this puebloan Late Holocene climatic interval was the most arid and highly variable climatic period of the last 3400 years. …
Influences Of Seasonality And Habitat Quality On Great Lakes Coastal Wetland Fish Community Composition And Diets, Sara N. Diller, Anna M. Harrison, Kurt P. Kowalski, Valerie J. Brady, Jan J. H. Ciborowski, Matthew J. Cooper, Joshua D. Dumke, Joseph P. Gathman, Carl R. Ruetz Iii, Donald G. Uzarski, Douglas A. Wilcox, Jeffrey S. Schaeffer
Influences Of Seasonality And Habitat Quality On Great Lakes Coastal Wetland Fish Community Composition And Diets, Sara N. Diller, Anna M. Harrison, Kurt P. Kowalski, Valerie J. Brady, Jan J. H. Ciborowski, Matthew J. Cooper, Joshua D. Dumke, Joseph P. Gathman, Carl R. Ruetz Iii, Donald G. Uzarski, Douglas A. Wilcox, Jeffrey S. Schaeffer
United States Geological Survey: Staff Publications
Great Lakes coastal wetlands (GLCW) have been severely degraded by anthropogenic activity over the last several decades despite their critical role in fish production. Many Great Lakes fish species use coastal wetland habitats for spawning, feeding, shelter, and nurseries throughout the year. The goal of our study was to compare GLCW fish community composition in the spring, summer, and fall months and investigate how water quality relates to fish diversity, the presence of functional groups, and juvenile fish diets. We summarized fish data collected from GLCW across the basin and used the coastal wetland monitoring program’s water quality-land use indicator …
Mgrre_Lithstriplog_Gere 1_21005008860000, Mgrre Western Michigan University
Mgrre_Lithstriplog_Gere 1_21005008860000, Mgrre Western Michigan University
Legacy Color Lithology Strip Logs
No abstract provided.
Mgrre_Lithstriplog_Redder 1_21005070310000, Mgrre Western Michigan University
Mgrre_Lithstriplog_Redder 1_21005070310000, Mgrre Western Michigan University
Legacy Color Lithology Strip Logs
No abstract provided.
Mgrre_Lithstriplog_Wolters, S. S. 1_21005077900000, Mgrre Western Michigan University
Mgrre_Lithstriplog_Wolters, S. S. 1_21005077900000, Mgrre Western Michigan University
Legacy Color Lithology Strip Logs
No abstract provided.
Mgrre_Lithstriplog_Buskirk, Henry 1_21005075730000, Mgrre Western Michigan University
Mgrre_Lithstriplog_Buskirk, Henry 1_21005075730000, Mgrre Western Michigan University
Legacy Color Lithology Strip Logs
No abstract provided.
Mgrre_Lithstriplog_Snell, B. 1_21005077830000, Mgrre Western Michigan University
Mgrre_Lithstriplog_Snell, B. 1_21005077830000, Mgrre Western Michigan University
Legacy Color Lithology Strip Logs
No abstract provided.
Mgrre_Lithstriplog_May, James H. & Wilma 1_21005096930000, Mgrre Western Michigan University
Mgrre_Lithstriplog_May, James H. & Wilma 1_21005096930000, Mgrre Western Michigan University
Legacy Color Lithology Strip Logs
No abstract provided.
Mgrre_Lithstriplog_Vanderwiede, A. & R. And Boeskool, H. 1_21005064570000, Mgrre Western Michigan University
Mgrre_Lithstriplog_Vanderwiede, A. & R. And Boeskool, H. 1_21005064570000, Mgrre Western Michigan University
Legacy Color Lithology Strip Logs
No abstract provided.
Mgrre_Lithstriplog_Humphrey, Clarence & Carrie 1_21005007180000, Mgrre Western Michigan University
Mgrre_Lithstriplog_Humphrey, Clarence & Carrie 1_21005007180000, Mgrre Western Michigan University
Legacy Color Lithology Strip Logs
No abstract provided.
Mgrre_Lithstriplog_Charbonneau, J Henry 1_21011163540000, Mgrre Western Michigan University
Mgrre_Lithstriplog_Charbonneau, J Henry 1_21011163540000, Mgrre Western Michigan University
Legacy Color Lithology Strip Logs
No abstract provided.
Mgrre_Lithstriplog_Graczyk, Peter 1_21005085890000, Mgrre Western Michigan University
Mgrre_Lithstriplog_Graczyk, Peter 1_21005085890000, Mgrre Western Michigan University
Legacy Color Lithology Strip Logs
No abstract provided.
Mgrre_Lithstriplog_Pifer, Mrs, Catherine 1_21005056070000, Mgrre Western Michigan University
Mgrre_Lithstriplog_Pifer, Mrs, Catherine 1_21005056070000, Mgrre Western Michigan University
Legacy Color Lithology Strip Logs
No abstract provided.
Mgrre_Lithstriplog_Helein Agnes 1_21011037050000, Mgrre Western Michigan University
Mgrre_Lithstriplog_Helein Agnes 1_21011037050000, Mgrre Western Michigan University
Legacy Color Lithology Strip Logs
No abstract provided.
Mgrre_Lithstriplog_Peavy 3_21011044280000, Mgrre Western Michigan University
Mgrre_Lithstriplog_Peavy 3_21011044280000, Mgrre Western Michigan University
Legacy Color Lithology Strip Logs
No abstract provided.
Mgrre_Lithstriplog_Adams Township Land 1_21011095000000, Mgrre Western Michigan University
Mgrre_Lithstriplog_Adams Township Land 1_21011095000000, Mgrre Western Michigan University
Legacy Color Lithology Strip Logs
No abstract provided.
Mgrre_Lithstriplog_Staebler, John R. 1_21011110950000, Mgrre Western Michigan University
Mgrre_Lithstriplog_Staebler, John R. 1_21011110950000, Mgrre Western Michigan University
Legacy Color Lithology Strip Logs
No abstract provided.
Mgrre_Lithstriplog_Post, Lovell 7_21011119890000, Mgrre Western Michigan University
Mgrre_Lithstriplog_Post, Lovell 7_21011119890000, Mgrre Western Michigan University
Legacy Color Lithology Strip Logs
No abstract provided.
Mgrre_Lithstriplog_Keef, Wm 4_21011129740000, Mgrre Western Michigan University
Mgrre_Lithstriplog_Keef, Wm 4_21011129740000, Mgrre Western Michigan University
Legacy Color Lithology Strip Logs
No abstract provided.
Mgrre_Lithstriplog_Vaughan, Anita W 1_21011180180000, Mgrre Western Michigan University
Mgrre_Lithstriplog_Vaughan, Anita W 1_21011180180000, Mgrre Western Michigan University
Legacy Color Lithology Strip Logs
No abstract provided.
Mgrre_Lithstriplog_Franklin, Woodrow 1_21011190700000, Mgrre Western Michigan University
Mgrre_Lithstriplog_Franklin, Woodrow 1_21011190700000, Mgrre Western Michigan University
Legacy Color Lithology Strip Logs
No abstract provided.
Mgrre_Lithstriplog_Brooks, Nellie Et Al 1_21011197960000, Mgrre Western Michigan University
Mgrre_Lithstriplog_Brooks, Nellie Et Al 1_21011197960000, Mgrre Western Michigan University
Legacy Color Lithology Strip Logs
No abstract provided.
Mgrre_Lithstriplog_Lewis & Ball 1_21011201640000, Mgrre Western Michigan University
Mgrre_Lithstriplog_Lewis & Ball 1_21011201640000, Mgrre Western Michigan University
Legacy Color Lithology Strip Logs
No abstract provided.
Mgrre_Lithstriplog_Ellison, Katie 1_21011380210000, Mgrre Western Michigan University
Mgrre_Lithstriplog_Ellison, Katie 1_21011380210000, Mgrre Western Michigan University
Legacy Color Lithology Strip Logs
No abstract provided.